US2631981A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Rejection of inactive material from a fluidized catalyst regenerator
Assignee: Sinclair Refining Co
•
Filing: 1948-07-10
•
Granted: 1953-03-17
•
Expires: 1968-07-10
Abstract
No abstract record available.
Inventors
- 👤 Kenneth M Watson
- 👤 Robert E Howe
- 👤 Smith Robert Lormer
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:02
CPC Classifications
B; B01; B01J; B01J8/00; B01J8/005
Claims Analysis
Total Claims: 0
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1956-03-16 | 1956-09-15 | 1957-03-17 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1960-03-16 | 1960-09-15 | 1961-03-17 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1964-03-16 | 1964-09-15 | 1965-03-17 | $7700.00 | Window Closed / Lapsed |